The blade inlet and outlet velocity triangle for impulse turbine is shown in figure. At the inlet of turbine rotor the blade linear speed is 30 m/s. The magnitude of absolute velocity at inlet and outlet is 120 m/s and 70m/s respectively. The hydraulic efficiency (in %) is?a)70.83b)57.3c)61.43d)68.26Correct answer is option 'B'. Can you explain this answer?

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The blade inlet and outlet velocity triangle for impulse turbine is shown in figure. At the inlet of turbine rotor the blade linear speed is 30 m/s. The magnitude of absolute velocity at inlet and outlet is 120 m/s and 70m/s respectively. The hydraulic efficiency (in %) is?

a)
70.83
b)
57.3
c)
61.43
d)
68.26

Correct answer is option 'B'. Can you explain this answer?

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Verified Answer

The blade inlet and outlet velocity triangle for impulse turbine is s...

The maximum hydraulic efficiency for impulse turbine is given as

u₁=u₂ = 30 m/s

V₁= 120 m/s

VW₁= V₁ cos 35° = 120 cos35 = 98.3 m/s

V_w2 =V_r2 cos 30° - u₂= 80 cos35 -30 = 39.28 m/s

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